http://blog.krisk.org/2013/09/apples-new-facetime-sip-perspective.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+NotJustAstlinuxStuff+(Not+Just+AstLinux+Stuff)&utm_content=FaceBook&m=1

(Source: https://twitter.com/matthewlandis/status/382886118292594688)